When Al Gore ran for President in 2000, he filed a public financial disclosure report that revealed that his net worth was somewhere between $700,000 and $1.9 million.

This filing revealed that Al Gore had a fairly modest net worth, with his largest asset being listed as a home in Arlington, VA that was worth between $250,001 - $500,000.

Things changed drastically for former Vice President Gore when he left public office, as his net worth has dramatically increased since that time. Much was made of Mitt Romney's net worth during the 2012 Presidential election, but Al Gore may be worth more than even Mitt Romney, thanks to a very fruitful last 13 years.

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One of Al Gore's biggest scores over the past 10 years came from Current TV, which was purchased by Al Jazeera in January of 2013 for a reported $400 million. The network, which was founded by Gore and Joel Hyatt in 2002, officially launched in August of 2005 and was sold roughly 7 1/2 years later.

Al Gore owned a 20% stake in the network and reportedly walked away with $70 million once outstanding debt had been paid off.

Another major contributor to Al Gore's meteoric net worth increase over the past 13 years - his ties to Apple and Google.

One of Al Gore's first moves upon leaving office was to take a job at Google as an advisor. Al Gore took this job a full three years before the company went public in 2004, and it is rumored that Gore received stock options that were valued at as much as $40 million.

Gore also made a fortune off of his decision to serve on Apple's Board of Directors. Gore was appointed to the role in 2006 and has seen his net worth skyrocket thanks to the parabolic rise of Apple and its shares. Gore controls over 100,000 shares of Apple (combination of common shares and options that are still vesting), meaning that his stake in Apple is valued at well over $40 million.

So let's see - $70 million from his stake in Current TV, roughly $45 million from his position with Apple and another $30-$40 million (estimated) from his stake in Google.

On top of all of that, Gore also has a significant portion of his net worth invested in hedge funds, as well as owning a healthy real estate portfolio.

As if all of that weren't enough, Gore also makes between $150,000 - $200,000 per speech.

In short - the former Vice President's time outside of public office has been very fruitful, as he has managed to amass a massive personal fortune over a relatively short period of time.